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The National Institute of Standards and Technology coordinates the Micronutrients Measurement Quality Assurance Program (MMQAP) for laboratories that measure fatand water-soluble vitamins and carotenoids in human serum and plasma. This report describes the design of and results for the Winter, Spring and Fall 1990 MMQAP measurement comparability improvement studies: 1) Round Robin XVIII Fat-Soluble Vitamins and Carotenoids in Human Serum, 2) Round Robin XIX FatSoluble Vitamins and Carotenoids in Human Serum, and 3) Round Robin XX Fat-Soluble Vitamins and Carotenoids in Human Serum. The materials for Round Robin XVIII were shipped to participants in January 1990; participants were requested to provide their measurement results by March 5, 1990. The materials for Round Robin XIX were shipped to participants in May 1990; participants were requested to provide their measurement results by July 6, 1990. The materials for Round Robin XX were shipped to participants in August 1990; participants were requested to provide their measurement results by October 22, 1990.

NIST Micronutrients Measurement Quality Assurance Program Winter, Spring, and Fall 1990 Comparability Studies: Results for Round Robins XVIII, XIX, and XX Fat-Soluble Vitamins and Carotenoids in Human Serum